Sludge deep dehydration decrement system

Abstract

The utility model provides a sludge deep dehydration decrement treatment system. The system comprises a gravity concentration device, a sludge cutting machine, a centrifugal dehydrator, a sludge conditioning mechanism and a deep dehydration mechanism, the deep dehydration mechanism comprises a hot-press filtration, dehumidification and drying integrated machine, a hot water supply module and a dehumidification module, the hot water supply module and the dehumidification module are communicated with the hot-press filtration, dehumidification and drying integrated machine, and the hot water supply module and the dehumidification module are communicated with the hot-press filtration, dehumidification and drying integrated machine in the flowing direction of sludge. The gravity concentration device, the sludge cutting machine, the centrifugal dehydrator, the sludge conditioning mechanism and the hot-press filtration, dehumidification and drying integrated machine are communicated in sequence. According to the utility model, a process system of'gravity concentration decrement + cutting impurity removal + rapid conditioning concentration decrement + conditioning modification decrement + hot-pressing filtration dehumidification drying 'is adopted to carry out deep dehydration decrement treatment on sludge with the water content of more than 99%, so that the water content can be reduced to not more than 40%, and the subsequent resource treatment is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and particularly relates to a sludge deep dehydration and reduction system. Background Art

[0002] At present, the main methods for sludge treatment and disposal include sanitary landfill, incineration, aerobic composting, anaerobic digestion, etc. Since the moisture content of sludge is generally higher than 99% when untreated, it does not meet the disposal requirements. Therefore, no matter which sludge disposal method is adopted, reducing the moisture content of sludge and reducing its quantity are the prerequisite conditions.

[0003] At present, the methods for sludge dehydration include mechanical dehydration method, drying dehydration method, electrodialysis method, advanced oxidation dehydration, natural drying method, etc. Among them, the common ones are mechanical dehydration method and drying dehydration method. In order to further broaden various ways of sludge resource recycling, it is particularly necessary to carry out deep dehydration treatment on sludge. Although the mechanical dehydration method has attracted much attention for its high efficiency and low operation cost, the moisture content of sludge treated by this method often exceeds 60%, and only preliminary reduction of sludge can be achieved, which is difficult to meet the strict requirements of high dryness dehydration. In contrast, although the sludge drying method can meet the requirements of deep dehydration, its disadvantages such as high energy consumption, complex tail gas treatment, and large equipment investment cost cannot be ignored. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sludge deep dehydration and reduction system with high sludge dehydration efficiency, small equipment floor area and low energy consumption.

[0005] To achieve the above purpose, the utility model provides a sludge deep dehydration and reduction system, which includes a gravity thickening device, a sludge cutter, a centrifuge, a sludge conditioning mechanism, and a deep dehydration mechanism. The deep dehydration mechanism includes a hot press filtration and dehumidification drying integrated machine, and a hot water feeding module and a dehumidification module respectively communicated with the hot press filtration and dehumidification drying integrated machine. Among them, along the flow direction of the sludge, the gravity thickening device, the sludge cutter, the centrifuge, the sludge conditioning mechanism, and the hot press filtration and dehumidification drying integrated machine are sequentially communicated.

[0006] In a specific embodiment, the hot water feeding module includes a hot water tank, a pressing pump, a first centrifugal pump, and a heat pump. The first water inlet of the hot water tank is communicated with the water filtration outlet of the hot press filtration and dehumidification drying integrated machine. The second water inlet of the hot water tank is communicated with the water outlet of the heat pump. The first water outlet of the hot water tank, the water inlet of the first centrifugal pump, the water outlet of the first centrifugal pump, and the water inlet of the heat pump are sequentially communicated. The second water outlet of the hot water tank, the water inlet of the pressing pump, the water outlet of the pressing pump, and the hot water inlet of the hot press filtration and dehumidification drying integrated machine are sequentially communicated.

[0007] In a specific embodiment, the dehumidification module includes a vacuum pump, and the air extraction port of the vacuum pump is communicated with the liquid discharge port and the corner blowing port of the hot press filtration dehumidification and drying integrated machine.

[0008] In a specific embodiment, the dehumidification module further includes a buffer tank. The air extraction port of the vacuum pump is communicated with the air outlet of the buffer tank, and the air inlet of the buffer tank is communicated with the liquid discharge port and the corner blowing port on the hot press filtration dehumidification and drying integrated machine.

[0009] In a specific embodiment, the gravity thickening device includes a gravity thickening tank and a sludge scraper installed in the gravity thickening tank.

[0010] In a specific embodiment, the sludge conditioning mechanism includes a first conditioning tank and a second conditioning tank arranged in series, and a first sludge screw pump with its pump inlet communicated with the first conditioning tank and its pump outlet communicated with the second conditioning tank. The sludge inlet of the first conditioning tank is communicated with the sludge outlet of the centrifuge, and the sludge outlet of the second conditioning tank is communicated with the sludge inlet of the hot press filtration dehumidification and drying integrated machine.

[0011] In a specific embodiment, the system further includes a chemical dosing mechanism. The chemical dosing mechanism includes a first chemical dosing tank for containing flocculant, a second chemical dosing tank for containing coagulant, a first chemical dosing screw pump, and a second chemical dosing screw pump. The first chemical dosing tank is communicated with the first conditioning tank through the first chemical dosing screw pump, and the second chemical dosing tank is communicated with the first conditioning tank through the second chemical dosing screw pump.

[0012] In a specific embodiment, the chemical dosing mechanism further includes a third chemical dosing screw pump. The system further includes a pipe mixer installed on the pipeline connecting the sludge cutter and the centrifuge. The first inlet of the pipe mixer is communicated with the sludge outlet of the sludge cutter, the second inlet of the pipe mixer is communicated with the first chemical dosing tank through the third chemical dosing screw pump, and the outlet end of the pipe mixer is communicated with the centrifuge.

[0013] In a specific embodiment, the system further includes a conveying mechanism. The conveying mechanism includes a plunger pump and a second centrifugal pump. The pump inlets of the plunger pump and the second centrifugal pump are both communicated with the sludge outlet of the second conditioning tank, and the pump outlets of the plunger pump and the second centrifugal pump are both communicated with the sludge inlet of the hot press filtration dehumidification and drying integrated machine.

[0014] In a specific embodiment, the conveying mechanism further includes a second sludge screw pump. The pump inlet of the second sludge screw pump is communicated with the sludge outlet of the sludge cutter, and the pump outlet of the second sludge screw pump is communicated with the first inlet of the pipe mixer.

[0015] The beneficial effects of the present utility model at least include:

[0016] The sludge deep dehydration and volume reduction system provided by the present utility model includes a gravity thickening device, a sludge cutter, a centrifugal dehydrator, a sludge conditioning mechanism, and a deep dehydration mechanism. The deep dehydration mechanism includes a hot press filter and dehumidifying dryer integrated machine, and a hot water feeding module and a dehumidifying module respectively communicated with the hot press filter and dehumidifying dryer integrated machine. Among them, along the flowing direction of the sludge, the gravity thickening device, the sludge cutter, the centrifugal dehydrator, the sludge conditioning mechanism, and the hot press filter and dehumidifying dryer integrated machine are sequentially communicated in series; among them, the gravity thickening device is used for the first dehydration, the sludge cutter is used for cutting and removing impurities, the centrifugal dehydrator is used for quickly dehydrating the sludge mixed with a conditioner by centrifugal force, the sludge conditioning mechanism is used for conditioning and modifying the sludge, and the hot press filter and dehumidifying dryer integrated machine is used for deep dehydration. The present utility model adopts a process system of "gravity thickening and volume reduction + cutting and impurity removal + quick conditioning and thickening and volume reduction + conditioning and modification and volume reduction + hot press filter and dehumidifying drying" to perform deep dehydration and volume reduction treatment on sludge with a water content greater than 99%, and can reduce the water content of the sludge to no more than 40%, which is convenient for subsequent resource utilization.

[0017] In addition to the above-described purposes, features, and advantages, the present utility model has other purposes, features, and advantages. The following will refer to the drawings for a further detailed description of the present utility model. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of a sludge deep dehydration and volume reduction system provided by an embodiment of the present utility model. Detailed Embodiment

[0019] The following will describe the embodiments of the present utility model in detail with reference to the drawings.

[0020] As Figure 1 shown, the present utility model provides a sludge deep dehydration and volume reduction system 100. The system 100 is used for dehydrating and reducing the volume of sludge with a high water content (the water content is higher than 99%), reducing the water content of the sludge to no more than 40%, reducing the sludge volume, facilitating its subsequent resource utilization, and reducing investment.

[0021] The system 100 includes a gravity thickening device 10, a sludge cutter 20, a centrifugal dehydrator 30, a sludge conditioning mechanism 40, a deep dehydration mechanism 50, a silo 60, and a conveying mechanism. Along the flowing direction of the sludge, the gravity thickening device 10, the sludge cutter 20, the centrifugal dehydrator 30, the sludge conditioning mechanism 40, the deep dehydration mechanism 50, and the silo 60 are sequentially communicated in series, and the conveying mechanism is used to connect each unit of the system 100.

[0022] The gravity thickening device 10 is used for the first dehydration of sludge.

[0023] In the present utility model, the water content of the sludge entering the gravity thickening device 10 is greater than 99%.

[0024] In this embodiment, the sludge entering the gravity thickening device 10 is the sludge from a municipal wastewater treatment plant, specifically the sludge generated from a secondary sedimentation tank and a high - efficiency sedimentation tank, and its water content is 99.2% - 99.7%.

[0025] In this embodiment, after the sludge with a water content of 99.2% - 99.7% is concentrated by the gravity thickening device 10, the water content of the sludge drops to 98% - 98.5%.

[0026] Optionally, the gravity thickening device 10 includes a gravity thickening tank 11 and a sludge scraper 12 installed in the gravity thickening tank 11.

[0027] In this embodiment, the gravity thickening tank 11 is of a steel - concrete structure, and the sludge scraper 12 is used to increase the sludge concentration.

[0028] In the present utility model, through the gravity thickening effect, larger particulate matters such as plastics, plant residues, and larger grit in the sludge are removed, protecting the subsequent treatment equipment from damage, reducing equipment failures and maintenance costs, and extending the service life of the equipment.

[0029] The sludge cutter 20 is used to cut up fibrous entanglements and the like in the sludge.

[0030] In the present utility model, through cutting and impurity removal, the fibrous entanglements mixed in the sludge can be cut up, avoiding the blockage of pipelines or other treatment equipment by these substances and improving the sludge treatment efficiency.

[0031] The sludge inlet of the sludge cutter 20 is communicated with the sludge outlet of the gravity thickening tank 11, and the sludge outlet of the sludge cutter 20 is communicated with the sludge inlet of the centrifuge dehydrator 30.

[0032] Optionally, the system 100 further includes a pipeline mixer 80 installed on the pipeline connecting the sludge cutter 20 and the centrifuge dehydrator 30. The first inlet of the pipeline mixer 80 is communicated with the sludge outlet of the sludge cutter 20, the second inlet of the pipeline mixer 80 is used for communication with a chemical dosing mechanism, and the outlet of the pipeline mixer 80 is communicated with the centrifuge dehydrator 30.

[0033] That is, the sludge cut by the sludge cutter 12 is mixed with the sludge conditioner PAM in the pipeline mixer 90 and then enters the centrifuge dehydrator 30.

[0034] In the present utility model, after adding PAM to rapidly condition the sludge and then using a centrifuge to rapidly concentrate and reduce the amount of the sludge, the concentration effect can be improved, the concentration time can be reduced, and it is helpful for the sludge to better perform chemical conditioning in the subsequent conditioning tank, thereby improving the efficiency of the entire sludge system.

[0035] The centrifugal dehydrator 30 is used to perform secondary dehydration on the sludge.

[0036] In this embodiment, after the sludge with a water content of 98% - 98.5% is rapidly concentrated by the centrifugal dehydrator 20, the water content of the sludge is reduced to 97% - 98%.

[0037] The sludge conditioning mechanism 40 is used to condition and modify the sludge.

[0038] In the present utility model, the sludge is conditioned and modified by adding polyacrylamide (PAM) flocculant and polyaluminum chloride (PAC) coagulant.

[0039] The main purpose of adding the flocculant and the coagulant is to improve the dehydration performance of the sludge, increase its solid matter concentration, enable the deep dehydration mechanism to more effectively remove the water in the sludge, form a tighter sludge cake, and thus improve the production capacity and efficiency of the equipment.

[0040] In this embodiment, after the sludge with a water content of 97% - 98% is conditioned and modified by the sludge conditioning mechanism 40, the water content of the sludge is reduced to about 97%.

[0041] Optionally, the sludge conditioning mechanism 40 includes a first-stage conditioning tank 41 and a second-stage conditioning tank 42 arranged in series, and a first sludge screw pump 43 with its pump inlet communicating with the first-stage conditioning tank 41 and its pump outlet communicating with the second-stage conditioning tank 42. The sludge inlet of the first-stage conditioning tank 41 communicates with the sludge outlet of the centrifugal dehydrator 30, and the sludge outlet of the second-stage conditioning tank 42 communicates with the sludge inlet of the deep dehydration mechanism 50.

[0042] In the present utility model, both the first-stage conditioning tank 41 and the second-stage conditioning tank 42 include a tank body and a stirring structure arranged on the tank body. The stirring structure is used to stir the sludge and the conditioning agent evenly.

[0043] In the present utility model, by arranging two conditioning tanks arranged in series for sludge conditioning, it can ensure that the sludge and the conditioning agent are fully mixed, prevent the precipitation and chromatography of the sludge, and make it easier for subsequent treatment.

[0044] Optionally, the system 100 further includes a chemical dosing mechanism 90, which includes a first chemical dosing tank 91 for accommodating flocculant, a second chemical dosing tank 92 for accommodating coagulant, a first chemical dosing screw pump 93, and a second chemical dosing screw pump 94. The first chemical dosing tank 91 is communicated with the primary conditioning tank 41 through the first chemical dosing screw pump 93, and the second chemical dosing tank 92 is communicated with the primary conditioning tank 41 through the second chemical dosing screw pump 94.

[0045] In this embodiment, the flocculant is polyacrylamide PAM, and the coagulant is polyaluminum chloride PAC.

[0046] Optionally, the chemical dosing mechanism 90 further includes a third chemical dosing screw pump 95. The first chemical dosing tank 91 is communicated with the second inlet of the pipe mixer 80 through the third chemical dosing screw pump 95.

[0047] The deep dewatering mechanism 50 is used for deep dewatering of sludge.

[0048] The deep dewatering mechanism 50 includes a hot press filtration, dehumidification and drying integrated machine 51 communicated with the sludge outlet of the sludge conditioning mechanism 40, a hot water feeding module 52 and a dehumidification module 53 respectively communicated with the hot press filtration, dehumidification and drying integrated machine 51.

[0049] The hot press filtration, dehumidification and drying integrated machine 51 is used for deep dewatering and volume reduction of sludge. Through the action of pressure difference and temperature difference, deep dewatering and volume reduction of sludge are achieved. During the operation of this equipment, it is not necessary to improve the drying effect through backmixing or mixing, and no dust will be generated during the drying process of sludge. At the same time, since the material temperature is relatively low during the drying process, the influence on the calorific value of sludge can be reduced. In addition, compared with other drying technologies, the hot press filtration, dehumidification and drying integrated machine has a simple structure, is convenient for maintenance, and generates less gas volume and wastewater volume during operation, which reduces energy consumption, investment and operation and treatment costs.

[0050] In this embodiment, after the sludge with a water content of about 97% undergoes deep dewatering and volume reduction by the hot press filtration, dehumidification and drying integrated machine 51, the water content of the sludge is reduced to no more than 40%.

[0051] The conditioned sludge is subjected to deep dewatering and volume reduction by the hot press filtration, dehumidification and drying integrated machine 51, so that the water content of the sludge is reduced to no more than 40%, the sludge volume is reduced, which is convenient for its subsequent resource utilization and reduces investment.

[0052] The hot water feeding mechanism 52 includes a hot water tank 521, a pressing pump 522, a first centrifugal pump 523 and a heat pump 524. The first water inlet of the hot water tank 521 is communicated with the water filtering outlet of the hot press filtration and dehumidification drying integrated machine 51. The second water inlet of the hot water tank 522 is communicated with the water outlet of the heat pump 524. The first water outlet of the hot water tank 521, the water inlet of the first centrifugal pump 523, the water outlet of the first centrifugal pump 523 and the water inlet of the heat pump 524 are communicated in sequence. The second water outlet of the hot water tank 521, the water inlet of the pressing pump 522, the water outlet of the pressing pump 522 and the hot water inlet of the hot press filtration and dehumidification drying integrated machine 51 are communicated in sequence.

[0053] After the sludge feeding is completed, first, hot pressing dehydration is carried out by the pressing pump 522. The pressing hot water is input into the hot press filtration and dehumidification drying integrated machine 51 through the pressing pump 522 via the hot water tank 521. The water in the pressing process returns to the hot water tank 521 through the pipeline. The heat supplement of the pressing hot water comes from the heat pump 524. The water in the hot water tank 521 is transported to the heat pump 524 by the first centrifugal pump 523 for heating, and the heated water returns to the hot water tank 521.

[0054] In the present utility model, the pressing pump 522 introduces hot water into the diaphragm filter plate of the hot press filtration and dehumidification drying integrated machine 51 through a pipeline. One is to indirectly heat the sludge through the diaphragm; the other is to provide pressure to the diaphragm to facilitate the extrusion of the sludge.

[0055] The dehumidification module 53 includes a buffer tank 531 and a vacuum pump 532. The air extraction port of the vacuum pump 532 is communicated with the air outlet of the buffer tank 531. The air inlet of the buffer tank 531 is communicated with the liquid discharge port and the corner blowing port provided on the hot press filtration and dehumidification drying integrated machine 51.

[0056] The sludge after hot pressing is subjected to negative pressure vacuum by the vacuum pump 532. During the negative pressure vacuum process, the water contained in the sludge turns into water vapor due to the decrease in the boiling point in the negative pressure vacuum environment and enters the buffer tank 531 for condensation, and the gas is discharged outside through the vacuum pump 532.

[0057] The silo 60 is used to store the sludge deeply dehydrated by the hot press filtration and dehumidification drying integrated machine 51.

[0058] In the present utility model, the silo 60 is made of steel structure, providing a safe, dry and reliable storage environment for the dried sludge.

[0059] The conveying mechanism includes a second sludge screw pump 71, a plunger pump 72, a second centrifugal pump 73 and a heating screw conveyor 74.

[0060] The second sludge screw pump 71 is used to transport the sludge discharged from the sludge outlet of the sludge cutter to the pipeline mixer 80. The pump inlet of the second sludge screw pump 71 is communicated with the sludge outlet of the sludge cutter 20, and the pump outlet of the second sludge screw pump 71 is communicated with the first inlet of the pipeline mixer 80.

[0061] The plunger pump 72 and the second centrifugal pump 73 are arranged in parallel, and both are used to transport the sludge in the secondary conditioning tank 42 to the hot press filter dehumidifying and drying integrated machine 51. The pump inlets of the plunger pump 72 and the second centrifugal pump 73 are both communicated with the sludge outlet of the secondary conditioning tank 42, and the pump outlets of the plunger pump 72 and the second centrifugal pump 73 are both communicated with the sludge inlet of the hot press filter dehumidifying and drying integrated machine 51.

[0062] The heating screw conveyor 74 is used to transport the sludge deeply dehydrated by the hot press filter dehumidifying and drying integrated machine 51 to the silo 60. The feed inlet of the heating screw conveyor 74 is communicated with the sludge outlet of the hot press filter dehumidifying and drying integrated machine 51, and the discharge outlet of the heating screw conveyor 74 is communicated with the silo 60.

[0063] By transporting the sludge through the heating screw conveyor 74, the sludge can be heated, promoting the evaporation of moisture in the sludge and strengthening the dehydration effect of the sludge.

[0064] The dehydration treatment process of the sludge is specifically as follows:

[0065] The sludge with a water content of 99.2% - 99.7% enters the gravity thickening device 10 under the action of the transport pump for thickening, reducing the water content to 98% - 98.5%; the sludge after gravity thickening is communicated with the sludge cutter 20 through a pipeline, and the sludge after the fiber winding is broken by the sludge cutter is transported to the pipeline mixer 80 through the second sludge screw pump 71 through a pipeline, and is mixed with the conditioning agent in the pipeline mixer 80 and then enters the centrifuge 30 for rapid dehydration. The water content of the sludge after rapid thickening is reduced from 98% - 98.5% to 97% - 98%; the thickened sludge is transported to the sludge conditioning mechanism 50 through a pipeline for dosing conditioning and modification. The sludge after being conditioned by the primary conditioning tank 41 is sent to the secondary conditioning tank 42 through the first sludge screw pump 43 for re-mixing to ensure the full mixing of the sludge and the agent, prevent the precipitation and chromatography of the sludge, and the water content of the conditioned and modified sludge is reduced to about 97%; the conditioned sludge is respectively transported to the hot press filter dehumidifying and drying integrated machine 52 through the second centrifugal pump 73 and the plunger pump 72 for deep reduction dehydration, and the water content of the sludge after deep reduction dehydration is reduced to no more than 40%; the sludge dried by the hot press filter dehumidifying and drying integrated machine 52 is sent to the silo 60 through the heating screw conveyor 74 for storage.

[0066] The above content is a further detailed description of the present utility model in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the present utility model belongs, without departing from the concept of the present utility model, several simple deductions and substitutions can still be made, which should all be regarded as belonging to the protection scope of the present utility model.

Claims

1. A sludge deep dehydration and reduction system, characterized in that The system includes a gravity thickening device, a sludge cutter, a centrifuge, a sludge conditioning mechanism, and a deep dewatering mechanism. The deep dewatering mechanism includes a hot press filter and dehumidifying dryer integrated machine, and a hot water feeding module and a dehumidifying module respectively communicated with the hot press filter and dehumidifying dryer integrated machine. Among them, along the flow direction of the sludge, the gravity thickening device, the sludge cutter, the centrifuge, the sludge conditioning mechanism, and the hot press filter and dehumidifying dryer integrated machine are sequentially communicated in series.

2. The sludge deep dehydration and reduction system according to claim 1, characterized in that, The hot water feeding module includes a hot water tank, a pressing pump, a first centrifugal pump, and a heat pump. The first water inlet of the hot water tank is communicated with the water filtering outlet of the hot press filter and dehumidifying dryer integrated machine. The second water inlet of the hot water tank is communicated with the water outlet of the heat pump. The first water outlet of the hot water tank, the water inlet of the first centrifugal pump, the water outlet of the first centrifugal pump, and the water inlet of the heat pump are sequentially communicated. The second water outlet of the hot water tank, the water inlet of the pressing pump, the water outlet of the pressing pump, and the hot water inlet of the hot press filter and dehumidifying dryer integrated machine are sequentially communicated.

3. The sludge deep dehydration and reduction system according to claim 1, characterized in that The dehumidifying module includes a vacuum pump. The air extraction port of the vacuum pump is communicated with the liquid discharge port and the corner blowing port of the hot press filter and dehumidifying dryer integrated machine.

4. The sludge deep dehydration and reduction system according to claim 3, wherein, The dehumidifying module further includes a buffer tank. The air extraction port of the vacuum pump is communicated with the air outlet of the buffer tank. The air inlet of the buffer tank is communicated with the liquid discharge port and the corner blowing port on the hot press filter and dehumidifying dryer integrated machine.

5. The sludge deep dehydration and reduction system according to claim 1, characterized in that, The gravity thickening device includes a gravity thickening tank and a sludge scraper installed in the gravity thickening tank.

6. The sludge deep dehydration and reduction system according to any one of claims 1 to 4, characterized in that The sludge conditioning mechanism includes a first conditioning tank and a second conditioning tank arranged in series, and a first sludge screw pump with its pump inlet communicated with the first conditioning tank and its pump outlet communicated with the second conditioning tank. The sludge inlet of the first conditioning tank is communicated with the sludge outlet of the centrifuge. The sludge outlet of the second conditioning tank is communicated with the sludge inlet of the hot press filter and dehumidifying dryer integrated machine.

7. The sludge deep dehydration and reduction system according to claim 6, characterized in that The system further includes a chemical adding mechanism. The chemical adding mechanism includes a first chemical adding tank for containing a flocculant, a second chemical adding tank for containing a coagulant, a first chemical adding screw pump, and a second chemical adding screw pump. The first chemical adding tank is communicated with the first conditioning tank through the first chemical adding screw pump. The second chemical adding tank is communicated with the first conditioning tank through the second chemical adding screw pump.

8. The sludge deep dehydration and reduction system according to claim 7, wherein The chemical adding mechanism further includes a third chemical adding screw pump. The system further includes a pipe mixer installed on the pipeline connecting the sludge cutter and the centrifuge. The first inlet of the pipe mixer is communicated with the sludge outlet of the sludge cutter. The second inlet of the pipe mixer is communicated with the first chemical adding tank through the third chemical adding screw pump. The outlet end of the pipe mixer is communicated with the centrifuge.

9. The sludge deep dehydration and reduction system according to claim 8, wherein, The system further includes a conveying mechanism. The conveying mechanism includes a plunger pump and a second centrifugal pump. The pump inlets of the plunger pump and the second centrifugal pump are both communicated with the sludge outlet of the second conditioning tank. The pump outlets of the plunger pump and the second centrifugal pump are both communicated with the sludge inlet of the hot press filter and dehumidifying dryer integrated machine.

10. The sludge deep dehydration and reduction system according to claim 9, wherein The conveying mechanism further includes a second sludge screw pump. The pump inlet of the second sludge screw pump is communicated with the sludge outlet of the sludge cutter, and the pump outlet of the second sludge screw pump is communicated with the first inlet of the pipeline mixer.

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